Write a note on disorders of the circulatory system (Any two).

Explanation

Hypertension :
1. It is the most common circulatory disease. The normal blood pressure in man is 120/80 mmHg.
2. In cases when the diastolic pressure exceeds 90 mm Hg and the systolic pressure exceeds . 150 mm Hg ersistently, the condition is called hypertension.
3. Uncontrolled hypertension may damage the heart, brain and kidneys.
Coronary heart disease :
1. It occurs when the arteries are lined by atheroma. The build-up of atheroma contains cholesterol, fibres, dead muscle and platelets and is termed Atherosclerosis.
2. The cholesterol rich atheroma forms plaques in the inner lining of the arteries making them less elastic and reduces the blood flow.
3. Plaque grows within the artery and tends to form blood clots, forming coronary thrombus. Thrombus in a coronary artery results in heart attack.